How-2 create a ramdisk filesystem image
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March 2004, @Frank4DD
 
The image should be small to leave enough main memory
for standard operations, but big enough to fit a variety
of programs to be flexible in its use. Mainstream memory
is available between 256MB and 2GB. My preference is
to get smaller but fast memory, so I'll try to get by
with as little as 256MB main memory by sizing the ramdisk
to 64MB.

1.create a empty 64MB file
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dd if=/dev/zero of=net4 bs=1M count=64

2. create filesystem in the 64MB file
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mke2fs -F -m 0 -b 1024 net4

3. mount the new 64MB image file
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mkdir net4-mount
mount -o loop net4 net4-mount

Done. Next, configure, compile and install busybox into
the mounted image (configure --prefix=net4-mount).